Client keeps restarting

When i lauch League client i get the following message: ''There was a problem patching League of Legends. We'll restore a backup version and try updating again after you restart the patcher.'' I click restart, and the client restarts and i get the following message: ''We have restored this installation to an older version of League of Lgeneds. Now we'll try to patch it up to the latest version.'' Then i click Okay and i get the first message again, and it keeps repeating. I tried reinstalling the game but it didn't work. If anyone knows how, please help. Thank you!